WO2019198044A1 - Method for the manufacture of pneumatic tyres with low electrical resistance - Google Patents
Method for the manufacture of pneumatic tyres with low electrical resistance Download PDFInfo
- Publication number
- WO2019198044A1 WO2019198044A1 PCT/IB2019/053028 IB2019053028W WO2019198044A1 WO 2019198044 A1 WO2019198044 A1 WO 2019198044A1 IB 2019053028 W IB2019053028 W IB 2019053028W WO 2019198044 A1 WO2019198044 A1 WO 2019198044A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pneumatic tyre
- manufacture
- pneumatic
- electrical resistance
- low electrical
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000004020 conductor Substances 0.000 claims abstract description 9
- 230000008021 deposition Effects 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000000151 deposition Methods 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 238000004544 sputter deposition Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 238000007740 vapor deposition Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/08—Electric-charge-dissipating arrangements
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0605—Carbon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/20—Metallic material, boron or silicon on organic substrates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/26—Deposition of carbon only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
- B29D2030/526—Unvulcanised treads, e.g. on used tyres; Retreading the tread comprising means for discharging the electrostatic charge, e.g. conductive elements or portions having conductivity higher than the tread rubber
Definitions
- the present invention relates to a method for the manufacture of a pneumatic tyre with high electrical conductivity.
- Some types of pneumatic tyres such as those for passenger cars, are affected by the problem relating to low electrical conductivity and, therefore, to the difficulty with which the electrostatic charges, which inevitably form on the bodies of such cars, can be discharged to the ground by means of the passage of electric charges, firstly from the vehicle to the pneumatic tyre through the rim and, subsequently, from the pneumatic tyre to the ground.
- This problem is mainly due to replacement of the carbon black within the tread for vehicles with silica.
- a solution adopted in order to solve the above problem regards the insertion within the tread bands of one or more conductor elements, some of which define a portion of the rolling surface of the tread connected to the conductive components arranged within the pneumatic tyre.
- the presence of such conductor elements implies a series of disadvantages that are due both to possible irregular wear of the tread as a whole, and to a particular complexity of preparation of the tread that can, furthermore, impose the use of production means that are different from those that are normally employed.
- the inventors of the present invention have found a solution that guarantees the discharge to earth of the electrostatic charges formed on the car body, independently of the electrical conductivity of the various portions of the pneumatic tyre or of the degree of wear of the relative tread portion. In this way it will be possible to manufacture a pneumatic tyre characterized by a low rolling resistance, without this leading to problems caused by a failure to discharge the electrostatic charges to earth.
- the object of the present invention is a method for the manufacture of pneumatic tyres; said method being characterized in that it comprises a surface deposition step, wherein on an outer surface of a finished pneumatic tyre a conductive material is deposited in vapor form, up until the formation of a conductive layer.
- the conductive layer covers the entire outer surface of said pneumatic tyre.
- the conductive layer has a thickness of between 2 nm and 1 pm.
- finished pneumatic tyre refers to a pneumatic tyre that has already been subjected to the vulcanization process.
- said surface deposition step is performed by means of sputtering techniques or else carbon evaporation or vapor deposition.
- said conductive material is selected from graphite, aluminum, copper or alloys thereof.
- a further object of the present invention is a pneumatic tyre manufactured according to the present invention .
- a deposition was made on an outer surface of a pneumatic tyre and by means of a sputtering technique.
- the outer surface of the pneumatic tyre was used as a deposition surface in a Chemical Vapor Deposition process wherein the target material used was graphite.
- the deposition process was performed under vacuum at a pressure of less than 0.1 Pa.
- the pneumatic tyre was subjected to a measurement of the electrical resistance between the rim and a central portion of the central tread portion in accordance with the international standard ASTM F 1971-05. This measurement provided an electrical resistance value of 30 MOhm.
- the measurement provided an electrical resistance value greater than 100 MOhm.
- the method of the present invention is able to guarantee the production of a pneumatic tyre comprising an outer surface characterized by a low electrical resistance. In this way the discharge to earth of the electrostatic charges formed on the car body is ensured.
- the discharge of the electrostatic charges takes place entirely on the outer surface of the pneumatic tyre, from the metal rim to the road surface. In this way it will be possible to manufacture a pneumatic tyre with low rolling resistance guaranteeing, at the same time, the correct discharge of the electrostatic charges formed on the car.
- the sputtering technique guarantees the implementation of the layer of the conductive material also within the recesses of the tread pattern. In this way, even when part of the tread is consumed, the presence of the layer of conductive material within the recesses will equally guarantee the conductivity needed in order to discharge the electrostatic charges to earth.
Abstract
The present invention relates to method for the manufacture of pneumatic tyres comprising a surface deposition step, wherein upon an outer surface of a pneumatic tyre a conductive material is deposited in vapor form up until the formation of a conductive layer is achieved. The invention also relates to a pneumatic tyre obtained by said method.
Description
METHOD FOR THE MANUFACTURE OF PNEUMATIC TYRES
WITH LOW ELECTRICAL RESISTANCE
DESCRIPTION
The present invention relates to a method for the manufacture of a pneumatic tyre with high electrical conductivity.
Some types of pneumatic tyres, such as those for passenger cars, are affected by the problem relating to low electrical conductivity and, therefore, to the difficulty with which the electrostatic charges, which inevitably form on the bodies of such cars, can be discharged to the ground by means of the passage of electric charges, firstly from the vehicle to the pneumatic tyre through the rim and, subsequently, from the pneumatic tyre to the ground. This problem is mainly due to replacement of the carbon black within the tread for vehicles with silica. In fact, as is known to a person skilled in the art, the use of silica as a substitution for carbon black, if on the one hand makes it possible to obtain significant advantages both with regard to rolling resistance and wet grip, on the other hand implies the disadvantage, which increases with increased silica content, of determining an increase in the electrical
resistivity of the compounds themselves.
A solution adopted in order to solve the above problem regards the insertion within the tread bands of one or more conductor elements, some of which define a portion of the rolling surface of the tread connected to the conductive components arranged within the pneumatic tyre. The presence of such conductor elements implies a series of disadvantages that are due both to possible irregular wear of the tread as a whole, and to a particular complexity of preparation of the tread that can, furthermore, impose the use of production means that are different from those that are normally employed.
For a more complete understanding of the problems mentioned above, it should be pointed out that, in order to further improve the rolling resistance, also within the compounds of the inner portions of the pneumatic tyre, the carbon black can be replaced with silica. This necessarily results in a decrease in conductivity also of the inner portions and, consequently, the passage of the electric charges within the pneumatic tyre will be further disadvantaged .
The inventors of the present invention have found a solution that guarantees the discharge to earth of the electrostatic charges formed on the car body, independently
of the electrical conductivity of the various portions of the pneumatic tyre or of the degree of wear of the relative tread portion. In this way it will be possible to manufacture a pneumatic tyre characterized by a low rolling resistance, without this leading to problems caused by a failure to discharge the electrostatic charges to earth.
The object of the present invention is a method for the manufacture of pneumatic tyres; said method being characterized in that it comprises a surface deposition step, wherein on an outer surface of a finished pneumatic tyre a conductive material is deposited in vapor form, up until the formation of a conductive layer.
Preferably, the conductive layer covers the entire outer surface of said pneumatic tyre.
Preferably, the conductive layer has a thickness of between 2 nm and 1 pm.
The term "finished pneumatic tyre" refers to a pneumatic tyre that has already been subjected to the vulcanization process.
Preferably, said surface deposition step is performed by means of sputtering techniques or else carbon evaporation or vapor deposition.
Preferably, said conductive material is selected from graphite, aluminum, copper or alloys thereof.
A further object of the present invention is a pneumatic tyre manufactured according to the present invention .
For a better understanding of the present invention, the following example is given for illustrative and non limiting purpose.
EXAMPLES
A deposition was made on an outer surface of a pneumatic tyre and by means of a sputtering technique. In particular, the outer surface of the pneumatic tyre was used as a deposition surface in a Chemical Vapor Deposition process wherein the target material used was graphite. The deposition process was performed under vacuum at a pressure of less than 0.1 Pa.
By means of the deposition process described above, a 0.1 pm layer of graphite was deposited over the entire outer surface of the pneumatic tyre. In this regard it should be specified that the graphite layer was also deposited upon the outer surface portions of the pneumatic tyre between the tread pattern blocks .
After the formation of the graphite layer, the pneumatic tyre was subjected to a measurement of the electrical resistance between the rim and a central portion of the central tread portion in accordance with the
international standard ASTM F 1971-05. This measurement provided an electrical resistance value of 30 MOhm.
The same measurement, carried out under the same operating conditions, was performed on the same type of pneumatic tyre, which however was not subjected to the surface deposition step and was, therefore, devoid of the graphite layer. The measurement provided an electrical resistance value greater than 100 MOhm.
From the experimental tests described above it is clear how the method of the present invention is able to guarantee the production of a pneumatic tyre comprising an outer surface characterized by a low electrical resistance. In this way the discharge to earth of the electrostatic charges formed on the car body is ensured. With the pneumatic tyre of the present invention, the discharge of the electrostatic charges takes place entirely on the outer surface of the pneumatic tyre, from the metal rim to the road surface. In this way it will be possible to manufacture a pneumatic tyre with low rolling resistance guaranteeing, at the same time, the correct discharge of the electrostatic charges formed on the car.
Furthermore, the sputtering technique guarantees the implementation of the layer of the conductive material also within the recesses of the tread pattern. In this way, even
when part of the tread is consumed, the presence of the layer of conductive material within the recesses will equally guarantee the conductivity needed in order to discharge the electrostatic charges to earth.
Claims
1. Method for the manufacture of pneumatic tyres; said method being characterized in that it comprises a surface deposition step, wherein upon an outer surface of a pneumatic tyre a conductive material is deposited in vapor form up until the formation of a conductive layer.
2. Method according to claim 1, characterized in that said conductive layer covers the entire outer surface of said pneumatic tyre.
3. Method according to claim 1 or 2, characterized in that said conductive layer has a thickness of between 2 nm and 1 pm .
4. Method according to one of the preceding claims, characterized in that said surface deposition step is performed by means of the sputtering technique or carbon evaporation or vapor deposition.
5. Method according to one of the preceding claims, characterized in that said conductive material is selected from graphite, aluminum, copper or alloys thereof.
6. Pneumatic tyre manufactured with the method according to one of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102018000004503 | 2018-04-13 | ||
| IT102018000004503A IT201800004503A1 (en) | 2018-04-13 | 2018-04-13 | METHOD FOR MAKING A TIRE WITH LOW ELECTRIC RESISTANCE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2019198044A1 true WO2019198044A1 (en) | 2019-10-17 |
Family
ID=62875160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2019/053028 WO2019198044A1 (en) | 2018-04-13 | 2019-04-12 | Method for the manufacture of pneumatic tyres with low electrical resistance |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | IT201800004503A1 (en) |
| WO (1) | WO2019198044A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1857262A1 (en) * | 2006-05-16 | 2007-11-21 | Continental Aktiengesellschaft | Method for producing a pneumatic tyre for a vehicle |
| US20090107595A1 (en) * | 2007-10-25 | 2009-04-30 | Toyo Tire & Rubber Co., Ltd. | Pneumatic Tire |
| CN202098233U (en) * | 2011-04-26 | 2012-01-04 | 张德志 | Outer tire of graphene tire |
| JP2013103412A (en) * | 2011-11-14 | 2013-05-30 | Bridgestone Corp | Method for manufacturing metal film and method for manufacturing pneumatic tire |
| JP2014051216A (en) * | 2012-09-07 | 2014-03-20 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| WO2015083119A1 (en) * | 2013-12-04 | 2015-06-11 | Bridgestone Corporation | Tyre comprising a graphite or graphene cover film deposited on an inner-layer surface |
-
2018
- 2018-04-13 IT IT102018000004503A patent/IT201800004503A1/en unknown
-
2019
- 2019-04-12 WO PCT/IB2019/053028 patent/WO2019198044A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1857262A1 (en) * | 2006-05-16 | 2007-11-21 | Continental Aktiengesellschaft | Method for producing a pneumatic tyre for a vehicle |
| US20090107595A1 (en) * | 2007-10-25 | 2009-04-30 | Toyo Tire & Rubber Co., Ltd. | Pneumatic Tire |
| CN202098233U (en) * | 2011-04-26 | 2012-01-04 | 张德志 | Outer tire of graphene tire |
| JP2013103412A (en) * | 2011-11-14 | 2013-05-30 | Bridgestone Corp | Method for manufacturing metal film and method for manufacturing pneumatic tire |
| JP2014051216A (en) * | 2012-09-07 | 2014-03-20 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| WO2015083119A1 (en) * | 2013-12-04 | 2015-06-11 | Bridgestone Corporation | Tyre comprising a graphite or graphene cover film deposited on an inner-layer surface |
Also Published As
| Publication number | Publication date |
|---|---|
| IT201800004503A1 (en) | 2019-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4908905B2 (en) | Pneumatic tire | |
| US2339546A (en) | Nonstatic tire | |
| EP0830954B1 (en) | Tyre having silica reinforced rubber tread with outer, carbon black reinforced rubber strip | |
| JP2006143208A (en) | Localization conducting rubber | |
| JP5389868B2 (en) | Pneumatic tire | |
| JP2007153092A (en) | Pneumatic tire, and manufacturing method of the pneumatic tire | |
| US11897294B2 (en) | Tire having a conductivity path | |
| EP2763844B1 (en) | Antistatic vehicle tire and method of manufacturing such a tire | |
| EP1554135B1 (en) | Conductivity path for non-conductive tire tread | |
| WO2019198044A1 (en) | Method for the manufacture of pneumatic tyres with low electrical resistance | |
| JP6759703B2 (en) | Pneumatic tires and their manufacturing methods | |
| US9517662B2 (en) | Pneumatic tire | |
| JP3763640B2 (en) | Pneumatic tire | |
| JP3045494B1 (en) | Pneumatic tire | |
| JP2008222135A (en) | Tire | |
| EP3785948B1 (en) | Tire | |
| JP3733458B2 (en) | Pneumatic tire manufacturing method | |
| JP4319264B2 (en) | Pneumatic tire | |
| US10639944B2 (en) | Pneumatic tire | |
| US10688827B2 (en) | Pneumatic tire | |
| US10632789B2 (en) | Pneumatic tire | |
| WO2020074388A1 (en) | Tyre with low electrical resistance | |
| JP6792482B2 (en) | Pneumatic tires | |
| GB1592661A (en) | Method of making tyres | |
| JP6825371B2 (en) | Pneumatic tires |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 19724925 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 19724925 Country of ref document: EP Kind code of ref document: A1 |